CyberKnife treatment in London for prostate cancer

My father was diagnosed with prostate cancer a few months ago. He had an open surgery about a month ago but the surgery was not successful due to his other medical conditions. His doctor recommended him to start radiotherapy, and we are planning to take him to the UK where we can receive a better treatment. I know Texas University, Sloan Kettering and John Hopkins are the best in the US, but I dont have any information about UK cancer centers. Since two weeks ago I have been searching on the Internet to find a reputable prostate cancer treatment center in the UK, but unfortunately I have not been able to make my mind based on online data. Can you introduce to me any specific hospital or treatment center considering he is not covered by NHS and we will pay for the treatment.

Your father might consider treatment at the Cromwell Hospital which has tomotherapy (the world's most advanced IMRT for prostate cancer). The treatment course is given over seven and a half weeks as an outpatient. Cyberknife treatment is also available in London at the Harley Street Clinic, but it is probably not yet as conventionally validated as the other options